fix: upgrade @loopback/core from 6.1.6 to 6.1.9

Snyk has created this PR to upgrade @loopback/core from 6.1.6 to 6.1.9.

See this package in npm:
@loopback/core

See this project in Snyk:
https://app.snyk.io/org/ashishkaushik/project/f76bdd59-5144-494e-8d4d-bcb7b855e63e?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -46,7 +46,7 @@
   "dependencies": {
     "@loopback/boot": "^7.0.9",
     "@loopback/context": "^7.0.9",
-    "@loopback/core": "^6.1.6",
+    "@loopback/core": "^6.1.9",
     "@loopback/repository": "^7.0.9",
     "@loopback/rest": "^14.0.9",
     "express-rate-limit": "^6.4.0",